I used rustoluem inside my Jeep and on a few few spots on the outside.... I wish I had never touched the stuff.
It's crap. It doesn't hold up, and it's impossible to clean.
Eventually I'm going to re-do it in Monstaliner.
1981 CJ7, AMC 258, MC2100, T18, Dana 300, OME 2.5" lift, front locker, 32" Kenda mud terrains